Ovulation and Fertilization in the Hormone-Stimulated Calf

Summary Thirty-two veal calves, of unknown age but varying in weight between 90 and 180 pounds, were subjected to a series of subcutaneous injections of gonadotropic extracts predominantly of follicle-stimulating activity, followed by an intravenous injection of luteinizing extract and artificial insemination. Moderate to extreme follicular stimulation was induced in all but one animal, but corpora lutea were formed in only 50 per cent of the calves. Thirtyfive ova were recovered from ten animals, but only seven (representing two individuals) showed evidence of fertilization.